Readily-soluble vat color preparations



Patented Apr. 30, "1929.

WIIHELM BAUER AND ALFRED HERRE, or ornannn,

PATENT ounce.

NEAR COLOGNE, AND ALBERT 'FU'NKE, OE HOCHST-ON-THE-MAIN, GERMANY, ASSIGNORS TO GRASSELLI STUFFCORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE. i

BEADILY-SOLUBLE VAT COLOR PREPARATIONS.

No Drawing. .Griginal app1ication filed November 29, 1924, Serial No. 752,936, and in Germany December 10, 1923. Divided and this application filed May We have invented certain new and useful improvements in readily soluble vat color preparations.

This invention relates to the production of vat color preparations which dissolve readily in water with simultaneous formation i of the leuco compounds, and to vat color preparations which may be made readily soluble by the addition of alkali. The solid, dry vat color preparations also form part of the present invention.

The constant increase of the use ofthe vat colors for dyeing exceedingly fastshades on vegetable or animal fibers is somewhat hampered by complications in the method of applying these colors to the fiber. The dyestuffs have to be brought into a soluble form by treating same in aqueous suspension with a reducing agent at sometimes high temperature, whereas the preparations which form the subject of this invention are readily soluble in cold or, at the most, in lukewarm water and can be used as easily as direct cotton colors. 1

We have found if water insoluble vat I colorsare treated with a dispersing agent,

the dyestuffs are transformed into a comminuted form, which allows them to react instantaneously with the reducing agent in presence of cold water to form the easily soluble leuco compounds. Among the compounds which display such a dispersing action, we have found that easily soluble car bohydrates which might also have a reducing effect, such as glucose, dextrine, etc., can be used. The un-vatted dyestuff is treated with easily soluble carbohydrates together with caustic alkalies and hydrosulphite. The best method of procedure is to evaporate the wet dyestuif paste with the above mentioned carbohydrates and mix the material so obtained with alkali and hydrosulphite. The preparations are stable and on introduction into warm water yield a vat which is immediately ready for use. p

The preparations of this invention may also be prepared without the use of'alkali.

The dyestuif paste is mixed with the carbohydrate, evaporated and then hydro'sulphite is added. The preparations obtained in this manner are likewise very stable. Itis only necessary when the paste is to be used for dyeing, to add alkali.

17, 1926. Serial No. 109,796. 1

ther illustrate the invention butit is to be understood that the invention is not limited to the vat colors mentioned, nor to the speclfic dlspersing or reducing agents used.

1 10 parts by weight of the dyestufi' described in U. S. Patent 1,074,405 are mixed as a wet paste with 5 parts by weight ofrglu cose and evaporated to dryness. The mixture so obtained is ground with 11 parts by weight of sodium hydrosulphite powder and 6.5 parts by weight of caustic soda under excluslonof air. The resulting preparation is stable and yields on introduction into warm water a vat which is immediately ready for use.

10 parts by weight of the dyestufi described in U. S. Patent 1,07 4,405 are mixed as a wet paste with 5 parts by weight of glucose and evaporated to dryness. The mixture so obtained is ground with 11 parts by weight of sodium hydrosulphite powder under exclusion of air. The resulting preparation is llkepgse veryfstabile. When it ils desired to use e paste or em it is on necessa to add alkali. y ry This application is a division of our parent ber 29, 1924.

We claim:

1. As a new product, a dry readily soluble yat color preparation comprising a dispersed insoluble vat dyestufi", an easily soluble carbohydrate and a reducing agent.

2. As a new product, a dryreadily soluble vat color preparation comprising a dispersed .insoluble vat dyestufl, glucose, and a reducing agent.

3. As a new product, a dry vat color preparation comprising a dispersed insoluble vat dyestulf, an easily soluble carbohydrate, and a hydrosulphite.

4. As a new product, a dry vat color preparation comprising a dispersed insoluble vat dyestuif, glucose, and a hydrosulphite.

5. As a new product, a dry readil soluble "vat color preparation comprising a ispersed insoluble vat dyestuif, an easily soluble carbohydrate, a hydrosulphite and an alkali.

6. As a new product, a dry readily soluble I vat color preparation comprising a dis ersed insoluble vat dyestufi, glucose, a hy rosulphite, and an alkali.

7. The process of producing dry readily soluble vat color preparations which coinprises preparing a mixture of the insoluble vat colors with an easily soluble carbohydrate having a reducing actionand water, drying the mixture and mixing a reducing agent therewith.

8. The process of producing dry readily soluble Vat color preparations which comprises preparing a mixture of the insoluble vat colors with glucose and water, drying the mixture and mixing a reducing agent therei with.

9. The process of producing dry readily soluble vatcolor preparations which com- 1 prises preparing a mixture of the insoluble vat colors with glucose and water, drying the mixkture and mixing a hydrosulphite therewit .w v

10. The process of producing dry readily soluble vat color preparations which comprises adding glucose to a wet paste of the insoluble vat colors, drying the mixture and mixing a hydrosulphite and an alkali therewith.

In testimony whereof, we alfix our signatures.

WILHELM BAUER. ALFRED HERRE. ALBERT FUNKE. 

